题目内容
Which of the following compounds shows the smallest chemical shifts of protons? ( )
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Which of the following nucleus exhibit zero nuclear magnetic moments and do not produce nuclear magnetic resonance signals? ( )
From the NMR spectra of ethylene and acetylene, the proton chemical shift values are 5.8 and 2.8, respectively. The reason for the large chemical shift value of proton peaks of the ethylene is ( ).
How many spin orientations does an atomic nucleus with spin quantum number I = 1/2 have in the external magnetic field? ( )
In the NMR spectrum of CH3CH2CH3, the proton signal of CH2 is split into ( ) by the proton coupling of CH3.
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